JP2529004Y2 - Low noise chisel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chisel used for crushing concrete, asphalt and the like.

[0002]

2. Description of the Related Art A chisel crushes concrete or the like by an axial impact force generated by a crusher using an engine, hydraulic pressure, air pressure, or the like as an impact source. I have.

[0003]

[Problem to be solved by the invention] Such a chisel
As described above, only the impact force in the axial direction needs to be transmitted,
Depending on the material or load, a lateral vibration as shown in FIG. 2 is generated on the chisel shaft, which generates metal noise of 1 to 4 KHz and deteriorates the working environment.

[0004] It is an object of the present invention to provide a chisel that reduces the generation of noise.

[0005]

The structure of the chisel according to the present invention is as follows.

A low-noise chisel comprising a stopper formed near the center of the chisel shaft and three disc-shaped rubber rings mounted on top of the stopper.

[0007]

The operation as a chisel is the same as in the prior art.
The lateral vibration and noise energy generated by the impact force and the load transmitted from the crusher to the chisel is converted into thermal energy by the three rubber rings, absorbed and attenuated. As a result, noise can be reduced by 5 to 10 dB (A) as compared with the conventional example.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
Is a mounting portion, and 4 is a disk-shaped rubber ring mounted on the upper part of a stopper 1a formed substantially at the center of the chisel shaft 1, and three pieces are superposed. The above rubber ring 4
Is provided with a hole having a diameter slightly smaller than that of the chisel shaft 1 in the center, and the stopper 1 is inserted through the hole from the mounting portion 3 of the chisel shaft 1.
It is a structure that can be mounted on or removed from a.

When the rubber ring 4 is attached to the chisel shaft 1,
The vibration and noise energy in the horizontal direction is converted into heat energy by the rubber ring 4 and absorbed and attenuated.

[0010]

[Effects of the Invention] As described above, the present invention has a rubber ring attached to a chisel shaft, which is 5 to 1 compared to the conventional example.
Metal noise of 0 dB (A) can be reduced. As a result, the work environment can be improved and the problem of noise pollution can be improved.

Also, since the rubber ring is merely mounted, the cost for noise reduction is small, and the mounting is simple, which is convenient for replacement.

[Brief description of the drawings]

FIG. 1 is a side view of a chisel fitted with a rubber ring according to the present invention.

FIG. 2 is an explanatory diagram of a lateral vibration mode generated on a chisel shaft.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chisel shaft 1a Stopper 2 Tip 3 Mounting part 4 Rubber ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A low-noise chisel comprising a stopper formed near the center of a chisel shaft and three disc-shaped rubber rings mounted on top of the stopper.